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What oilpan and rmay said...
Also, I have a 25 amp electronic charger that has a desulphation stage for my deep cycle 40 amp hour battery. I charge from the grid mostly & use the alternator only sporadically if at all. Out of my last battery on this set up, I got 7 years of cycling the battery down to about 50% of charge daily--driving 11,000 miles a year. So, I think yes it likely helps preserve and extend the battery life. A key rule of thumb: pick a three stage charger that has AT LEAST 40% of the amps that your battery stores. If you have a 50 amp hr battery, don't get a charger less than 20 amps... and so on...
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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